Could be cam chain rattle. Famous for sloppy chains and inferior tensioners. Starts about 100k and downhill from there. Could try an engine flush as tensioners may be sludged. I have a 4.0L with a rattle at start up but stops after 5 seconds. Chain is shot.
SOURCE: clutch vibrating
Two reasons for this. Rattling is usually faulty pressure plate which means clutch overhaul. Depending on which Focus some have a rubber mounted flywheel which dies and must be replaced. Either way its gearbox out and check. First check all gearbox and engine mounts, but it sounds more serious.
SOURCE: I have a 2000 ford explorer and it has a loud whining noise after
power steering pump is low or getting weak
SOURCE: My 2000 Ford Explorer is making a loud squeaking
if you can put car on lift( drive on ramp type lift where wheels are NOT hanging free) raise car up and have someone else pull down on front bumper repeatedly while you try to locate noise by putting either your ear or hand on/near different "pivot" points. SUCH AS: lower ball joints, control arm bushings, shock absorbers,sway bar,etc. check bolts nuts etc. for tightness. sometimes a giveaway is a RUST MARK near a bolt head or nut-meaning something was rubbing. if you still cant narrow it down, take a can of silcone spray,or WD40, liquid wrench and one by one spray each pivot point untill the squeak lessens or goes away.if that happens youve got your culprit.
SOURCE: 98 Ford Explorer engine/exhaust noise
When catalytic converters go bad, the porcelain matrix inside comes loose and is noisy.
But you can just unbolt it, break up the loose chunks, pour out the pieces, and it will run better than ever.
If you don't pass the next emissions test, then replace it.
But it could just be the heat shield rattling instead.
Take the shield off first, to see if it goes away.
SOURCE: Loud rattling noise while accelerating
First thing i would try...... ISOHEET, Red bottle..... allows water to be mixed into the fuel and be burnt out of the tank.
get a good qaulity fuel injection cleaner, if you can locate the brand MALCO, i found it quite succesful..... and go with a full tank of premium fuel such as ammoco or shell......do not use yellow bottle of heet
Testimonial: "Might be water in the tank?"
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